6. The electrochemical equivalent of silver is .01118. How much of that metal will be deposited by a current of 1,000 amperes in 5 hours? Change 1,000 kilowatts to watts; to horse-power; to ergs per second. Answer any five. SHEFFIELD SCIENTIFIC SCHOOL. (Fifty-five minutes.) 1. Find the length of a lead rod having a mass of 1.52 kilograms, a diameter of 1.25 centimeters and a density of 11.3 grams per cubic centimeter. 2. A 15 gram bullet moving with a velocity of 600 meters per second penetrates 32 centimeters of wood. What is the average resistance (force) to penetration? 3. What is a barometer? forms and their uses. 4. What is Boyle's law? for investigation of this law? Describe one or more of the familiar What simple method may be employed 5. Describe the magnetic field due to a helix conveying a current. Show how to find the north pole of the solenoid. 6. What is meant by the fundamental and what by the overtones of a musical string? What influences do the overtones have upon the sound? 7. Describe and explain the colors of thin plates, or of Newton's rings.* ARTICLES IN CURRENT MAGAZINES. Readers making use of this department will confer a favor ou the editor by sending him a postal card to that effect. Farming for June: "Brown Swiss Cattle-A Great Dairy Breed:" "What Has Been Accomplished by Milking Machines." For July: "Does a Small Flock of Sheep Really Pay?" "A Record-breaking Crop that Failed:" "Two Hundred Per Cent Profit in Forestry;" "A Working Plan for a Farm." Forestry and Irrigation for May: "Forest Management in Europe:" "Colorado Short Course in Forestry;" "Inland Waterways Commission:" "The Norway Poplar;" "Work in a National Forest;" "Deforestation in Syria;" "Planting in California Forests;" "An Educational Tree Campaign;" "A Ranger's Cabin;" "Timber Tests by Forest Service." For June: "Forest Management in Europe:" "Appalachian-White Mountain Forests; "A New Tree Juniper;" "Wood in the Vehicle Industry;" "The Jamestown Exposition;" "The Tree, the City, and the Citizen." For July: "Report of Women's Forestry Committee;" "Dead Timber in the National Forests;" "Convincing Testimony for Appalachian Reserves;" "Among the Shake-Makers in California." Garden Magazine for August: "Crisp Celery from the Home Garden,” photographs by Julian Burroughs, Nathan R. Graves and others; "Shall Evergreens be Planted in August?" photographs by W. McCollom, Nathan R. Graves and others; "Raising Perennials from Seed," photographs by Nathan R. Graves and Henry Troth: "Stonework without a Mason," photographs by the author and Claude H. Miller; "When Cannas are at their Best," photographs by the author, Henry Troth and E. J. Hall; “Housegrown Daffodils for Christmas." photographs by the author and H. E. Angell; "A Timber Crop that Really Pays," photographs by the author; "The Simple Art of Budding Stone Fruits," photographs by Claude H. Miller. *Reprints of these questions can be had if ordered before October 1, 1907. CURRENT MAGAZINE ARTICLES 617 For "The Climate of Yukon TerriMonthly Weather Review for January: tory:" "The Growth of Fog in Unsaturated Air." For February: "Meteorological Work at Camp Wellman, Danes Island, Spitzbergen." March: "The Temperature in the Front and in the Rear of Anticyclones, Compared with the Temperature in the Center Area." "Nature-Study Development in OnNature-Study Review for April: tario," S. Silcox; "Foundation of Chemistry in Nature-Study," John Brittain; "Nature-Study as an Education," Mary P. Anderson. Photo-Era for June: "Enlarging with the Lantern;" "Transparent Spots on Negatives, and How to Treat Them;" "Firelight Effects by Daylight;" "Combination Printing in Enlargements:" "A New Printing Paper." "The Problem of Age, Growth, and Popular Science Monthly for June: Death," Professor Charles S. Minot; "The Progress of Our Knowledge of the Flora of North America," Professor Lucien Marcus Underwood; "Notes on the Development of Telephone Service," Fred LeLand; "The Value of Science," M. H. Poincaré; "Hygienic Requirements for the Printing of Books and Papers," Professor Edmund B. Huey; "The Waste of Children," Dr. G. B. Mangold: "A Blazing Beach," Professor D. P. Penhallow. For July: "What We Owe to Agassiz," Professor Burt G. Wilder; "Notes on the Development of Telephone Service," Fred LeLand; "The Great Japanese Volcano Aso," Robert Anderson; "Control of the Colorado River Regained," Charles Alma Byers; "The Value of Science," M. H. Poincaré: "The New Hygiene," Professor Wilfred H. Manwaring; "The Forms of Selection with Reference to their Application to Man," G. P. Watkins; "Illustrations of Mediæval Earth-science," Dr. Charles R. Eastman; "The Progress of Science: Benjamin Franklin and the American Philosophical Society; The Celebration of the Bicentenary of the Birth of Linnæus by the New York Academy of Sciences; The State Universities and the System of Retiring Allowances of the Carnegie Foundation; Scientific Items." Review of Reviews for July: "Rubber as a World Product;" "A Year of Delayed Harvests." School World for June: "The Reform of Examinations;" "The Natural History of Animals;" "New Laboratories at the Whitgift Grammar School, Croyden, Eng." Science for July 5: For "Academic Freedom," by President Eliot. July 19: "Linnæus and American Botany." Scientific American for May 11: "The Manufacture of Matches in France." For May 18: "The Construction and Handling of Submarines;" "The Peril of the Broken Rail-Its Cause and Cure;" "Construction of For June 8: Florida Coast Railway." For June 1: "Some Unknown American Natural For June 15: Bridges;" "The Wonderful Sulphur Mines of Louisiana." "The "Mining in Newfoundland;" "Nature's Touch-me-nots." "The Transit of Mercury, November 14, 1907." For June 29: Heavens in July;" "Sound Signals for Mariners: An Inventive Field which "How Linoleums and Oilcloths are For July 13: is Not Overworked." Made. Scientific American Supplement for June 1: "The Fate of the Temple of Philae." "Smokeless Cities of the Future" "New Technical World for June: Colossus of Telescopes;" "Nature Fights the Railroads;" "Precious Stones at Home," Mrs. W. E. Burke; "Building a Lighthouse;" "Butter's Rival Gaining Favor;" "Explosives and Their Habits;" "The Opportunity the Small Farmer is Missing" "Photographing the Human Voice;" "Latest Styles in Locomotives." For July: "Grim Guardians of our Coast." René Bache; "City Built on Rubies;" "Railroad Creeps out to Sea;" "Beautiful Caverns of Luray;" "Curbing a Human Flood;" "Fireworks in the Making;" "Marvels of High-Speed Steel;" "Government Ownership in Canada;" "Largest Hydraulic Gold Mine in the World:" "Farm on the Ocean Bottom." For August: "To Check the Gnawing Sea," Charles Frederick Carter: "Railroads Race to the North," Aubrey Fullerton: "Importing Feathered Songsters," René Bache; "Building a Butterfly Dam," William Hard; "Smelting Steel by Electricity," Henry Hale; "Fire, Axe and the Oregon Fir." Day Allen Willey: "Life-saving and Swimming Hints," Montague A. Holbein; "The World's Largest Bear," Lillian E. Zeh; "The Wizard of Fruits and Flowers," Louis J. Simpson: "When is Life Extinct?" Emmett Campbell Hall; "New City Built on a Jersey Marsh." Thomas D. Richter: "Awakening of the Chinese Giant," Owen Macdonald; "Old Feat Still Stirs Wonder," Philip S. Rush; "Making Cloth from Paper," Frank N. Bauskett; "Shall We Travel on One Rail?" William T. Walsh. REPORTS OF MEETINGS. THE MISSOURI SOCIETY OF TEACHERS OF MATHEMATICS AND SCIENCE. The third annual (fifth regular) meeting of the Missouri Society of Teachers of Mathematics and Science was held at Columbia on May 4, 1907. A list of the officers for the coming year is given on another page of this journal. The annual dues were raised from $1.50 to $2.00. A resolution was adopted approving of the national organization of teachers of mathematics and science as far as already accomplished. A committee was provided for to report on the teaching of elementary algebra in secondary schools. The following program was carried out: SCIENCE DIVISION. Paper: "Mushrooms." DR. B. M. DUGGAR, University of Missouri. Paper: "Cathode Rays." DR. WILSON C. MORRIS. Warrensburg Normal School. MATHEMATICS DIVISION. Paper: "Beginning Algebra." CHARLES AMMERMAN, McKinley High School, St. Louis. Discussion led by HIERBERT P. STELLWAGEN, Yeatman High School, St. Louis. Special Methods of Attack. Paper: "Outlook for Mathematics." DR. E. R. HEDRICK, Missouri State University. Paper: "The Equation in Geometry." A. A. DODD, Manual Training High School, Kansas City, Mo. JOINT SESSION. Papers: "The Articulation of the Teaching of Science and Mathematics in the Grades and in the High School." (a) "The Articulation of Science," MR. S. A. DOUGLASS, Central High School, St. Louis. (b) "The Articulation of Mathematics," DR. L. D. AMES, University of Missouri. MEETING OF THE EASTERN ASSOCIATION OF PHYSICS TEACHERS. The Annual Meeting of this Association was held at Newton High School, Newtonville, Mass., March 23, being called to order by President Palmer with 41 members present. The secretary's printed report of the last meeting was accepted. He then presented the following annual report: During the past year, the twelfth of the Association, two regular and three special meetings have been held. The places of meeting were Simmons College, Massachusetts Institute of Technology, Everett High School, and Roxbury Latin School. The speakers at the meeting of March 24, 1906, were Prof. Brown of Simmons College, who showed the Thordarson Electrical Apparatus and other special pieces, and Prof. A. Wilmer Duff of Worcester Institute of Technology, who spoke on "Exposition, Experiment, and Discussion in the Teaching of Elementary Physics." Mr. Gilley, at a special meeting May 19, 1906, addressed the Association on "The School for Instrument Makers at the University of Leyden." The meeting of October 27, 1906, was a members' meeting, some twenty-two taking part, either in the review of a book or in the presentation of a piece of apparatus. At the special meeting held at the Everett High School, February 16, 1907, the topic, "The Formal Education of the Future Teacher of Secondary School Physics," was discussed by Prof. C. A. Adams of Harvard University, Prof. H. M. Goodwin of the Massachusetts Institute of Technology, and Messrs. Black and Andrews. On March 9, 1907, a special meeting was held at the Roxbury Latin School. The topic for discussion was "Opportunities Due the Secondary School Teacher of Physics." The speakers were Dr. William C. Collar of the Roxbury Latin School and Messrs. Charles S. Jackson, Manning, and J. W. Hutchins. At nearly every meeting new apparatus has been presented by the Apparatus Committee and other members. The committees on Magazine Literature and Current Events have reported at each regular meeting. The committee on Reference Books has acceptably fulfilled its duty in the issuance of a separate pamphlet. On February 2, 1907, there was a largely attended excursion to the Waltham Watch Works. The lecture and laboratory course on Alternating Currents at the Massachusetts Institute of Technology has claimed the attention of many of our members. This course, like that of last year, was provided through the Lowell Institute. Our membership has grown. In the death of Miss Girdwood the Association lost a valued member. Three active members have resigned and three have become associate members. One associate member has resigned. Six active and forty-eight associate members have been elected. There are at this time seventy-four active, sixty-nine associate, and two honorary members, a total of one hundred and forty-five. The treasurer in his annual report showed the finances to be in a good condition with a balance of $57.96 on hand. The committees on New Apparatus. Current Events in Physics and Magazine Literature presented splendid reports showing that they had been active and their work helpful to the membership of the Association. Mr. Cowen was continued as delegate to the Massachusetts Council of Education. Mr. Coolidge, for the committee on the "New Movement among Physics Teachers," made a brief report, which was followed by some remarks on the same subject by Prof. Sabine. Mr. Berry, explaining that SCHOOL SCIENCE AND MATHEMATICS had been obliged to raise the subscription price, moved that members desiring it shall pay 50 cents in addition to the regular annual dues, if arrangements can be made with the publishers to furnish the magazine to a portion only of our membership at club rates. Carried. Mr. Black was continued as associating Editor of SCHOOL SCIENCE AND MATHEMATICS. The election of officers for the ensuing year resulted as follows: Vice-President, N. Henry Black, Roxbury. Secretary, Frederick G. Jackson, Dorchester. Executive Committee, the foregoing, ex-officio; and Arthur H. Berry, Providence; John C. Packard, Brookline; Irving O. Palmer, Newton. Professor W. C. Sabine of Harvard University then addressed the Association on: "Microscopic Vision and the Ultra-Violet Microscope." At the afternoon session he gave notice that at the next meeting he would propose the following amendment to the constitution: The number of active members shall be unlimited. Mr. Cowen was requested to act as a committee of one to use his influence in arranging a Lowell Course for Physics Teachers for next year along lines similar to those of the last two years, on the subject of Steam and Gas Engines. A show of hands indicated that twenty-two of the members present would probably take the course on Engines, if it can be arranged. Professor Francis C. Van Dyck of Rutgers College then addressed the Association on: "Physics Teachers Lectures." ENCYCLOPEDIAS. In this busy age no home should be without a good up-to-date Encyclopedia and Dictionary. The Chicago Tribune under date of June 14th said: "A good encyclopedia is no longer regarded as a luxury; it is a necessity in every home. As a storehouse of facts it is a valuable accessory to the family reading class as well as to the individual members of the household. It should be conveniently placed, and the children early trained to refer to it the moment they need it: information acquired under such a stimulus of interest usually is retained. It is a great mistake to make a list of subjects to be looked up some other time; a string of unrelated facts makes but a slight impression on the brain, and in addition to this objection is another-'some other time' is apt to be no time at all, and that particular list generally reaches the waste basket without being checked off." We call the attention of our readers to a full page announcement of the United Editors' Encyclopedia and Dictionary in the present issue of this magazine. We own a set of this work and do not hesitate to recommend it to all those interested in this subject. Complete information regarding it can be obtained by addressing a postal card to the United Editors' Association, 28 Jackson Boulevard, Chicago. |